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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9404d8a3c076c1eec39378c457f9407ce09607e42318d8df64b5630b2b8a19f4' 
  AND token = 'Bw7gik6LeroknDuaNoQVZVrdJn8LXScDUcPaAhgoPJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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