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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc4d3baab789a26ced2f0dd40474ba9ae9ac9c2f9145c6e178a9078f751a1c2' 
  AND token = 'dNO77qHfN/0iCr8eRMNUmprZuZCvrz2FLK0KHqlBGjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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