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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66ecd2e90badbab8427a06e7eeef80838f9a7d7be95b5aed46df1554c0067b8' 
  AND token = 'swPgCBU14Sal84aT7pWb5mEDc/l5jV1LI58r2krkyco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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