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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71f37ead3a60ec641fcef5e1644926a3bf7c63294cb467a690897ccabbf96e7' 
  AND token = 'PdWvoEDLodoRP+/PM+80HhACtjoNy/Zt2qUjuC3TDmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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