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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773e40c0077638785a41e77fae2b4ac7984de1f34d70f2b48365a6e023aea7b9' 
  AND token = 'hl6B5F0C7aSfn7cHPhihJSZsOuAJviZp5JHkIYxDz28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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