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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b032889ed6088d9eb069e82e6827c438cd8a1419d98ac3fb791a628a573b026b' 
  AND token = 'WdbYHXkPfvm82XEGQRhgz+bm/LsC4rPAG4pw3ho8Q/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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