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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71b3e96340faa659f1891134fa7085f654ab1eaccfdd8b64bcb528e4f976e11' 
  AND token = 'EeBuzvJ/nvL8EOTqsLnlu0lD7zNxpZ+llwwI0S5LSWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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