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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4da373d76db24a3ae65bd2e87e45dc7193489157e54df64d020de66d006a41' 
  AND token = 'Uzi5Fc0CiUFL6XhUTtUmhJaf20Jgeq8ZtiFa7yhwq8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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