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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ec38a8ea31375e719e5cfc8d9f5890ed55352a5af8c7e9d15c025ddc185ad5' 
  AND token = 'gjlcbfOI3Z5d0DCwIJLu7S203L/xtWjd5Zdn2jk+EVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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