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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de151af39991081b7b1e17acae02fe0eefdf4b4b139ab2fec8d68a231b08e91' 
  AND token = '5HnQltenGsLl07/mjiMRYGli0v1LWCH/5mbfN3UAMYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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