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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5b681b7525ebf5f5757a7c6cb3ada01eafb758ff6078ae46d38d6b0362b69c' 
  AND token = 'CWaxL+4cOYSfqC9T2L+fy7hiI+kpJyAP4KJkzV/rX8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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