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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19eb746e91f54ab1d974add55e4b082149c8f35411ff9fea95e5bd98f1eefa23' 
  AND token = 'UD3LLhlr4LoH7tEpCIZwXwIBTbrjd15ULMEYFmq7vIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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