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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca75fab643b98175464a4efcaf88b57074b572457808e55a8cb461d2d5af0e42' 
  AND token = 'y3K/X1AaVZ967weeyiY+O8uZN1K8eWzsC7jpqA6dFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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