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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b55cdc4ea42a934e5a9af4f7419b352ea6ca8a67137c1cc387c2a60399613e' 
  AND token = 'KCu9M/YtRFuQj5/X0sCXaef3Tt+mVcfOoxjx9hit3lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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