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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f923ad690f8544332deb9f74c9c44d3d67818a15921bec017c5d6e4e1de17d9f' 
  AND token = 'A0HWMCSSTRC6dGBSY4ebHOPksU82atxYjJ3tJe29Svw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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