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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9fac8fe95f4a85aea47f379f3093d974f1efce4404e929e8c61a29187f0504' 
  AND token = 'lzXxt9OrY8TrzfuIaHcK+JwKxje2qejP29dL7nzRQVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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