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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b407944f9149af4babc719e0f4b1e7e125daab659f78458a3ace4035ca0e0a' 
  AND token = 'u/8g4dkT+H+LStbDF9fnJFpngMZ0Drc4Hs41ghJDQS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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