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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4fb66d4c23d9df1c84da5dc11224c871e5c77e01623bb0f7ff64416c0e93595' 
  AND token = 'fqMbf8pLJeqmJAtIAqqK9rG5HwwRDv54+Gm+tAasfkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}