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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a82546efae2201443fd427332b40f91d3ed7ca74223f9948c83e8c7f30caff' 
  AND token = 'Wi9lkdF9AMmF6Uv5uE5/lRqz7syUd4NfYtaBY33LhWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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