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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e6c7ccb3de06d7b8db35c02391a66cde1a49728867d5d785d90896f25adf1d' 
  AND token = '8/Py79zGTAxtzPPYMdZIoVC9ZtqCNKsbva95Twe6p7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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