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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d79aab95d1c6ae240563d77242ce2414920a3f9fd2a8c15c9023a2a947b336f' 
  AND token = 'ppoIbU2DbQzjvJ4g2AkfnBt9EfOWMvrOsw92ij3BuLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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