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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b582c475f9824e3163a234d5e46a8a803bf64964b45eacd95d20867856a16c73' 
  AND token = 'gS1ocbWyiUCuyK8wT/V+nd/ly/LSiSLGfqee/pnSNzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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