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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84b573ab0368ab66e9156ae47af51d9bb47b4d65cbbc920e29b42530a11a9ee' 
  AND token = 'EmkliqK7A5ngXKf2RyOQp3s4Tg2W+h6Ji2nZi5vv95c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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