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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1ebe753edc877fcfb6da15b7d39f5c8fe4a58efb2cf3380a5c3329c5a1fedf' 
  AND token = 'unI666RaduSg/N7Im02cUoxbJo7q2V62cBtZCsR4u4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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