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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e0257aaeaf2f4a0bf69531f9a2a299315468d1d8eaef5f95037a224fa26183' 
  AND token = 'V+w15/0MDcIORIQFKngMSgAJlY6VYpM7R1RR+nL59Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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