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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caffae73d6fb79fd4ad31e4933a479acee745a7889e8039e78b08957f0518c5' 
  AND token = 'a3Qiyh4CnA0ZahfQBC6BlWWIOR5vHWKy1ZegB84mjsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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