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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e146d4c304b3c394c9e3edfd3d570a9f5d5cd2465c379170366b4bdf6a3a50f7' 
  AND token = 'bhBJF1DT3JX8thH3GD1SAcRZ4THwK8DqIqrqM6IBRLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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