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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820b1adea0cf7918a56eee5b22c2a0896a606a8f0844fd8d184f457413871ea2' 
  AND token = 'gnBugTnC5xnd3MWDHevy/6hRjNJlGu1AbU8PbaFTFSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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