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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb7ffb419dda6f88b454d6b6b2eab9795196bc4ef2b59c3b8fb9334f336369b' 
  AND token = 'PnZ/JRbPNHsW9wY8HGx5AH1r0VcA9xf3NFgTT0E+QQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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