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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2acb4aa78d0c583339060a9d39a093a96c4f4c01053224c2ba7b80c8e656e7e0' 
  AND token = '2dPRILUH5kmYU7XUaPlIUP9Dwvp4q7s69aSsOAFba3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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