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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d40ea20df78be57bab58bffd85c3b5b0173fd1ab6b42136dd8d9785b44fcf4' 
  AND token = '8cKO/dPgHnmSfEDQftoYFnB6G20woQ9cqdVXDYFjTFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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