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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e517db92a1ae9ddeb21fc9e2c28f76ca6bc9f351b4ea48c2a0db2f7d99bb30c0' 
  AND token = '3vgdxRr/fkqhixbNOqyMP5oaABrzRBjUZdTvcA6IqP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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