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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb3f338be4bd6ccdf8b17d78121361a3389d20319f64ea15c9c7250a529e77b' 
  AND token = 'P5BEWVH9s618sIre++SUisBswkRBAWt/C6VQ/ZWN9fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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