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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95b4f3062291d1b34c03e1ca1921cad1124b1d49120cfe1b886d3b1b4f86ece' 
  AND token = 'gON3c2UeE38LRvYzqTJw7zThbYqxodVMrlBdy97ZQeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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