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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c86f4d1ed8ebde5cea11fafd10b9abb32bb4d7e3fd4eb1720f49fbab1126207' 
  AND token = 'yaEknsbn6eF8jW3rFkm4wqY8gd8wO62uI6iFeJyGkmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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