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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7198b6cd0d0aa4995c378608559a1b36af5b6c879b9a8911faaa6b153434b3bb' 
  AND token = 'huYh4yLflrv60kHfm7OT4WzAmrth7rruZCB6j9hadTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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