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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3564bc6ad7c5f6379e91aee5f68a3d130a56e1d84ce62e87f6567c9acaf88b14' 
  AND token = '9QppMAIlTXmh9mFP0me9wgb1fTE3iY2GITvKA+5wCaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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