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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b842f67ea4b906d747aa95809938da8de5e1e13aec7053c6f270ba970f2e38' 
  AND token = '5SCPgCPRkUnuRENN2tjCqm5Tpyat97hXNO0DqY1sJ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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