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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83e0d34a29bfb54808aa05eae683a59842f167a23be960adde49dee52240af9' 
  AND token = 'gLSdTdGk0uDz5T1HG+1SKYdmmrJFpEQlKoFcdH8SpwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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