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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a77fc55a6cb9b3957cbfc187d0dc8e4a596fb51353f0bc8ac128848704a835' 
  AND token = 'dT7BiH3fr9bWUOzdJQ5irHMAjxCiNqtx6jJqSV7axaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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