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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229d2bca2a48f86d80ac5b81739ca48d7c88d420a763085ccca307efb3e041f3' 
  AND token = '9KrkWEIiVsa9ROQvNa75LWr1hEm79v8HeQraW9lbSHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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