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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be7f225078f729386da89dc2270fb45d6bfbfed20c11e3e754467622d644b01' 
  AND token = 'XogS8kpK1RC5Nda4rfeXg3tIz6t9vtTU18cNcQpiXaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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