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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea8076dd3e2e0b5a5159ed8e61b08fd1efb0e124e295062a03a598ac1dfe19f' 
  AND token = 'LvNqAneJK27NjeNDqYIHjo0T1eObIUhv63za8geG0A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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