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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0486de5e54a55ba111415f97d8c71ddc9056c330849d3dce84b69724a7ee69b0' 
  AND token = '1qlbX0GbVAe7Bo+x0Q19KYn7PVtnQoGeadS2c802Snk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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