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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e011fe27f058e44d287a5085beba4109c06be251fa3af74eec81460ffec753' 
  AND token = 'KTT92hxsT8H2NQVMhIbz54ygdx16k643TjiQe+6qVCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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