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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183d1cbe5493147040c029915e81d3593c7399afa53d10db265b9f7a3742fc9e' 
  AND token = 'HXiUtqc4UKbweViibdkFpCigz102ygCj+qu81O1NraQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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