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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4f7345da8e8d46e1e2feac038e140f04eddafaebd78fbbf86d2b822a00f479' 
  AND token = '7B3MHxuWJVwygLhdHFcpYUxcABjmL1f04N20fyVgU9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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