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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db3c926e5072512ff9a4b396e995da2ba7aee09b6eca399c1180d60efb64eb9' 
  AND token = '71KKqj5KFiEnJNCyBDKSsyn7/5lCsCCILPVCn7nLOOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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