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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1cd2202fa9b47959a648442a598d718b15d3887b48028b8199e50401f2534d' 
  AND token = '0lJXR5P8aHtExn0vNvcI6QRiCt5dpyf0UVnjtR562Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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