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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f5afa9d75b6c59a7a4d0746a22f82a034ef7c8ce5cd8dd816997ce125721cc' 
  AND token = 'FZfluu+UCuTa4kjH0IzHfvY5WUm1hWikfVLXaUhFXdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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