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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238cdc13c9845aaaee1c42fd5f09b5cc5c4aa970daf4074f42860a7b4cc4c0c1' 
  AND token = 'gn3BPT/O5stEC+GA9oSdrgq7NjB8pZRJmY0eZaT44i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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