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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90de56899b6742c90817144db31753a03903d1ba8039033828f4c31ab4ae3a58' 
  AND token = '1mg+snM10uFUS38qLcCnhqyeXVHTCht5GtrBspsUxzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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