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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfdf6625b5a86e6c515f1a576ffaeb68e10cd8c160a84c7c83ef4998ac81a28' 
  AND token = 'maMuHF3rcYJ0BzL9fLG4RON+lfJHNoltOpCdGtAPSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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