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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec11aafe0254061f7bc857ed9472c333094f326f473482146b0eb577a5e0db2' 
  AND token = 'z1oq1zAZb5gMMgv7c0tBGFpm2igUo35fowmHaWept7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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