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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa435028c388f4d15143814116756a7aef21d1fca1b217af7294f249951c9fc9' 
  AND token = 'Qcl/8Oc69Or+YOCN8P2YKHjms0cZYQ4+XgA3yD2XhjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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