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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ad92a971453d6469684b4216119067659bf31418ada8f50b3414c066f8c2df' 
  AND token = 'M2bH64YJkGte/RhtP1XVvha4yJJIqx9fg6vKXfOhiag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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