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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd7d3eeb66e6f4c0c29fc7a8c4ab01cb21853100ed77370a0751dbe599550d5' 
  AND token = 'mxEcNrhoVSx65+H2AvXxv6zPG4ku9hlxAip69QrHgBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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