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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be2b29b86b15655a685717e0b08ffec19e14918a68b8e50b00fe7a589218543' 
  AND token = '8EEd1bGq0r7wLCOTfl0o/QsVCpZ/6wOaWI5P4HG8d3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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