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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c480ddd5fff5f71903d0bbacee8f406df63676a3866123e8c14e2829fe4208' 
  AND token = 'yCjVsKtfHw5+beVOvEsWxWrxP6u+d43ejYrpGhvxz7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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