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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9851f09ee2280ec14339f706238f527a56d5c5ee0390637c3bcab1337138edbb' 
  AND token = 'Lr0vQPu72cZqh3roz/g3tn92TjpBXxNBAY6KBrSAdM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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