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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ff4278be3256f5606e4ccd8b419c9c91a23c5bf36c2c0c96f1bfcffd92fc60' 
  AND token = 'FmB3PS1lHGS0Nx37Voy+vyHrjD1kedSzN+ZszkQjcnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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