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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6ec82f951908ec5cd23b35ce9b50af41f8d2beb29195f374aaf18646fc62e9' 
  AND token = 'SwipmczotUvPKHW+9Y69MsM9AR+b7YsMuR9r8oZd0mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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