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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eb3f600c32ecc7cbb9daff9ccc326b4fecd8f89ceeea6895315a0105fde3cf' 
  AND token = '7NHor7ZMYltEn+m0umlp5QpqnwaFv4603nWH7JoRN+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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