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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5835b00c31fae02cf968de65fe46629cea198d15e3c463c0479d9f0a1608b9' 
  AND token = 'CyKExIJn9DlTzODnBseNjggZJvWQ9jrfUI/B/a0yp6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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