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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7177f1334201ac4e6fe3547f5bf38358b9f85c753f03c2617708eb586cc48fb8' 
  AND token = 'qIUnF/+bdPbYX4utm4ohRpDBgGXcr33jta06SXqy5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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